package com.xxl.job.core.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * file tool
 * @author xuxueli 2017-12-29 17:56:48
 */
public final class FileUtil {

	private static Logger logger = LoggerFactory.getLogger(FileUtil.class);

	/**
	 * delete recursively
	 * @param root
	 * @return
	 */
	public static boolean deleteRecursively(File root) {
		if (root != null && root.exists()) {
			if (root.isDirectory()) {
				File[] children = root.listFiles();
				if (children != null) {
					for (File child : children) {
						deleteRecursively(child);
					}
				}
			}
			return root.delete();
		}
		return false;
	}

	public static void deleteFile(String fileName) {
		// file
		File file = new File(fileName);
		if (file.exists()) {
			file.delete();
		}
	}

	public static void writeFileContent(File file, byte[] data) {
		// file
		if (!file.exists()) {
			file.getParentFile().mkdirs();
		}
		// append file content
		FileOutputStream fos = null;
		try {
			fos = new FileOutputStream(file);
			fos.write(data);
			fos.flush();
		} catch (Exception e) {
			logger.error(e.getMessage(), e);
		} finally {
			if (fos != null) {
				try {
					fos.close();
				} catch (IOException e) {
					logger.error(e.getMessage(), e);
				}
			}
		}
	}

	public static byte[] readFileContent(File file) {
		Long filelength = file.length();
		byte[] filecontent = new byte[filelength.intValue()];
		FileInputStream in = null;
		try {
			in = new FileInputStream(file);
			in.read(filecontent);
			in.close();
		} catch (Exception e) {
			logger.error(e.getMessage(), e);
		} finally {
			if (in != null) {
				try {
					in.close();
				} catch (IOException e) {
					logger.error(e.getMessage(), e);
				}
			}
		}
		return filecontent;
	}
	/*public static void appendFileLine(String fileName, String content) {

	    // file
	    File file = new File(fileName);
	    if (!file.exists()) {
	        try {
	            file.createNewFile();
	        } catch (IOException e) {
	            logger.error(e.getMessage(), e);
	            return;
	        }
	    }

	    // content
	    if (content == null) {
	        content = "";
	    }
	    content += "\r\n";

	    // append file content
	    FileOutputStream fos = null;
	    try {
	        fos = new FileOutputStream(file, true);
	        fos.write(content.getBytes("utf-8"));
	        fos.flush();
	    } catch (Exception e) {
	        logger.error(e.getMessage(), e);
	    } finally {
	        if (fos != null) {
	            try {
	                fos.close();
	            } catch (IOException e) {
	                logger.error(e.getMessage(), e);
	            }
	        }
	    }

	}

	public static List<String> loadFileLines(String fileName){

	    List<String> result = new ArrayList<>();

	    // valid log file
	    File file = new File(fileName);
	    if (!file.exists()) {
	        return result;
	    }

	    // read file
	    StringBuffer logContentBuffer = new StringBuffer();
	    int toLineNum = 0;
	    LineNumberReader reader = null;
	    try {
	        //reader = new LineNumberReader(new FileReader(logFile));
	        reader = new LineNumberReader(new InputStreamReader(new FileInputStream(file), "utf-8"));
	        String line = null;
	        while ((line = reader.readLine())!=null) {
	            if (line!=null && line.trim().length()>0) {
	                result.add(line);
	            }
	        }
	    } catch (IOException e) {
	        logger.error(e.getMessage(), e);
	    } finally {
	        if (reader != null) {
	            try {
	                reader.close();
	            } catch (IOException e) {
	                logger.error(e.getMessage(), e);
	            }
	        }
	    }

	    return result;
	}*/
}
